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arXiv 1107.3207nucl-thhep-ph
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$\sqrt{s}$ =7和14 TeV pp碰撞中轻反核的产生

Light anti-nuclei production in pp collisions at $\sqrt{s}$=7 and 14 TeV

Yu-Liang Yan, Gang Chen, Xiao-Mei Li, Dai-Mei Zhou, Mei-Juan Wang, Shou-Yang Hu, Li Ye, Ben-Hao Sa

摘要:

基于相空间量子化和经典极限方法,提出了一个动态约束聚并模型,研究了$\sqrt{s}$ =7和14 TeV的pp非单衍射碰撞中轻核(反核)的产生.该计算是基于PYTHIA和PACIAE模型模拟的末态强子态,两个模型的事件样本均由1.2个$\times 10^8$事件组成。PACIAE模型计算的$\sqrt{s}$ =7 TeV时NSD pp碰撞的$\bar D$产额为6.247 $\times 10^{-5}$,与ALICE的粗略数据5.456 $\times 10^{-5}$比较,两者吻合较好.这在一定程度上表明了该方法的可靠性。用PACIAE和PYTHIA模型模拟计算了$\sqrt{s} $ =7和14 TeV的NSD pp碰撞中$\bar D$、$^3{\bar{He}}$和$_{\barΛ} ^3{\bar H}$的产额、横向动量分布和快度分布. PACIAE模型模拟的产率大于PYTHIA模型模拟的产率。这可能反映了部分子和强子再散射所起的作用。

英文摘要:

A dynamically constrained coalescence model based on the phase space quantization and classical limit method was proposed to investigate the production of light nuclei (anti-nuclei) in non-single diffractive (NSD) pp collisions at $\sqrt{s}$=7 and 14 TeV. This calculation was based on the final hadronic state in the PYTHIA and PACIAE model simulations, the event sample consisted of 1.2$\times 10^8$ events in both simulations. The PACIAE model calculated $\bar D$ yield of 6.247$\times 10^{-5}$ in NSD pp collisions at $\sqrt{s}$=7 TeV is well comparing with the ALICE rough datum of 5.456$\times 10^{-5}$. It indicated the reliability of proposed method in some extent. The yield, transverse momentum distribution, and rapidity distribution of the $\bar D$, $^3{\bar{He}}$, and $_{\barΛ} ^3{\bar H}$ in NSD pp collisions at $\sqrt{s} $=7 and 14 TeV were predicted by PACIAE and PYTHIA model simulations. The yield resulted from PACIAE model simulations is larger than the one from PYTHIA model. This might reflect the role played by the parton and hadron rescatterings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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